My favorite Free and Open Source (FOSS) projects that I ACTUALLY use and recommend!
I'm not affiliated with any of these.
I'm on Linux but some of these can run on Windows as well.
You can get most of these in your distro's software manager.
If you're downloading a Flatpak version of an app you may have to give it storage permissions for drag and drop and storage access to work (I just add "/mnt" in Filesystem -> Other files in Flatseal).
[same on mobile][same on mobile]Blender / Godot / PrusaSlicer
Audacious / VLC Media Player / MediaInfo / Ear Tag
I use it for custom OBS audio channels with JACK Input Client sources.
Handbrake does not have AMD VAAPI hardware acceleration so I use FFmpeg in the scary Terminal instead. Here's my list of commands that I use all the time - ffmpeg-commands.
It also supports Epic Games Store and Amazon Luna.
Some games need Proton-GE to run well.
[same on mobile]Secure and end-to-end encrypted on MATRIX.ORG protocol. Pick your favorite application, it will work because all of them are using the same backend (except for E2EE calls, those only work on Element Web and Element X for now).
Add me

Local encrypted database (file), nothing on the cloud.
KeepassXC [compatible with KeePassDX on mobile]
[same on mobile]For personal management of crypto.
[same on mobile]Docs, Spreadsheets etc.
I used it to format this page.
[same on mobile]for seeding Linux isos..
Virtual Machine Manager or VirtualBox
Organic Maps (Flatpak version is not listed on the website but is on Flathub)
Fun fact, all of Wikipedia (including images) is only 111GiB. That's almost half of COD MW 2019 xD
I recommend you download and install F-Droid for these for easy app management, NO registration needed. Most of these can still be installed via Google Play though. (Some are even on iOS).
Side note -> I recommend you to install a custom OS like LineageOS or GrapheneOS if you can. I've put my knowledge and pointers here (page coming soon).
F-Droid or alternatively Neo Store
Sometimes you may need to add a custom repository to get an app to show on F-Droid, I will put a link for that, don't worry.
To add a repository to F-Droid open the F-Droid app, go to Settings (the cog-wheel in the lower right), then Repositories, tap the + button, and either scan the QR Code from there, or enter the repo link manually.
Here's a list of some extra repos for you to discover.
FUTO Keyboard - Not on F-Droid by default but you can add its repository with this link.
[same on PC]Brave - Not on F-Droid by default but you can add its repository with this link.
Very useful if you're stuck with the default OS.
[same on PC]Local encrypted database (file), nothing on the cloud.
[same on PC]Secure and end-to-end encrypted on MATRIX.ORG protocol. Pick your favorite application, it will work because all of them are using the same backend.
Get on F-Droid -> Element Classic / Element X / FluffyChat
Add me

Local encrypted database (file), nothing on the cloud.
KeepassDX - Get on F-Droid [compatible with KeePassXC on PC]
[same on PC]Personal management of crypto.
Stack Wallet - Not on F-Droid by default but you can add its repository with this link.
[same on PC][same on PC][same on PC]Barcode Scanner - Get on F-Droid
Fossify Gallery - Get on F-Droid
Fossify Calendar - Get on F-Droid
Fossify Notes - Get on F-Droid
Traffic Light - Get on F-Droid
[same on PC]Offline Translator - Get on F-Droid
Fossify Voice Recorder - Get on F-Droid
Breezy Weather - Get on F-Droid
Fossify Contacts - Get on F-Droid
Fossify Phone - Get on F-Droid
Fossify File Manager - Get on F-Droid
Not a software but a great place to check if a company is screwing their customers so you don't get screwed.
Professional video editing program that runs on Linux and has an awesome free version. I give it lots of credit for enabling me to switch over to Linux because I can still do my job video editing. Do note that your videos need to be in AV1 video codec, Opus or FLAC audio codec and mp4 container. If you're on a Debian-based distro, use makereselvedeb to repackage the original download so that it integrates well with your system. If you're using an AMD GPU you need to install an OpenCL package from your package manager.
Video game storefront that sells your favorite games WITHOUT DRM! That means you will actually own them forever because you get the installation files and don't need an internet connection. The GOG Galaxy application doesn't work natively on Linux but Heroic Games Launcher integrates perfectly with achievements, playtime, cloud saves and is very easy to use.
Big contributor to the open-source ecosystem. Linux booster. Creator of hardware that respects you. One of the few corporations I actually like.
Almost every game runs on Linux now but this site has always been useful. You can check how well games are supported and see useful tweaks or commands that people are using to make them run better.
Great if you need a domain or a server. I love the vibes and payment options.